A note on power and sample size calculations for the Kruskal-Wallis test for ordered categorical data.

Although the Kruskal-Wallis test has been widely used to analyze ordered categorical data, power and sample size methods for this test have been investigated to a much lesser extent when the underlying multinomial distributions are unknown. This article generalizes the power and sample size procedures proposed by Fan et al. ( 2011 ) for continuous data to ordered categorical data, when estimates from a pilot study are used in the place of knowledge of the true underlying distribution. Simulations show that the proposed power and sample size formulas perform well. A myelin oligodendrocyte glycoprotein (MOG) induced experimental autoimmunce encephalomyelitis (EAE) mouse study is used to demonstrate the application of the methods.

Citation

Chunpeng Fan, Donghui Zhang. A note on power and sample size calculations for the Kruskal-Wallis test for ordered categorical data. Journal of biopharmaceutical statistics. 2012;22(6):1162-73

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PMID: 23075015

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